阿摩線上測驗
29. Flooding in this area _____ to happen far more often a decade ago than it does today, but it has changed.
(A) has been used
(B)had used
(C) has used
(D) used
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統計： A(58), B(82), C(20), D(80), E(0) #1990743
統計： A(58), B(82), C(20), D(80), E(0) #1990743
